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In the new S3 console, the CORS configuration must be JSON. Read more here.
In your case, the JSON CORS configuration can be written as follow:
[
{
"AllowedHeaders": [
"*"
],
"AllowedMethods": [
"POST",
"GET",
"PUT"
],
"AllowedOrigins": [
"*"
]
}
]
Source:stackexchange.com